Following their first adventure where oenophile Oz Clarke and wine novice James May strived to demystify the mysteries of French wine we join the pair in California as they take a month-long trip around the revered Californian wineries. They begin in Santa Barbara county - home of Pinot Noir where Oz is a local hero and inspiration to winemakers. Travelling on they meet wine 'renegades', an eccentric millionaire, bicker when James crashes the Monaco Recreational Vehicle and argue over the quality of wine - from he inaccessible and over-priced to 'two-buck-Chuck' who knocks out bottles for only two dollars. Finally they arrive at the glamorous Napa Valley, where they are dismayed to discover that they're staying in the car park. The pair argue about who will empty the RV's waste tank, then sample Californian sparkling wine at Taittinger estate. Next, the Schramsberg estate, where they have a heated debate about what bubbles taste like!